package com.linkedin.pinot.tools.scan.query;

/**
 * Copyright (C) 2014-2015 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.List;


public class GroupByOperator {
  List<Object> _columns;

  public GroupByOperator(List<Object> columns) {
    _columns = columns;
  }

  List<Object> _getGroupBys() {
    return _columns;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    GroupByOperator that = (GroupByOperator) o;
    if (_columns == null && that._columns == null) {
      return true;
    } else if (_columns == null || that._columns == null) {
      return false;
    } else if (_columns.size() != that._columns.size()) {
      return false;
    }

    int i = 0;
    for (Object object : _columns) {
      Object otherObject = that._columns.get(i++);
      if (!object.toString().equals(otherObject.toString())) {
        return false;
      }
    }
    return true;
  }

  @Override
  public int hashCode() {
    if (_columns == null || _columns.isEmpty()) {
      return 0;
    }

    int hashCode = 0;
    for (Object column : _columns) {
      hashCode += 31 * column.hashCode();
    }
    return hashCode;
  }
}
